Leaders of the CPB Thakin Than Tun and Thakin Soe, while in Insein prison in July 1941, had co-authored the Insein Manifesto which, against the prevailing opinion in the nationalist movement led by the Dobama Asiayone (We Burmans Association), identified world fascism as the main enemy in the coming war and called for temporary cooperation with the British in a broad allied coalition which should include the Soviet Union. Soe had already gone underground to organise resistance against the Japanese Occupation, and Than Tun as Minister of Land and Agriculture was able to pass on Japanese intelligence to Soe, while other Communist leaders Thakin Thein Pe and Thakin Tin Shwe made contact with the exiled colonial government in Simla, India. Aung San was War Minister in the puppet administration set up on 1 August 1943 which also included the Socialist leaders Thakin Nu and Thakin Mya.[1][2]

On 27 March 1945 Aung San successfully led the BNA in a national uprising against the Japanese in collaboration with the Allied Forces. It was the last of Thakin Soe's four wartime directives titled Independence Statement No.4:The Time To Revolt Has Come, issued on 27 February on the eve of the AFPFL's crucial meeting in Rangoon, that outlined the main tactical and organisational principles of the resistance movement. Bohmu Ba Htoo, the communist commander of the BNA's northwest military command based in Mandalay, started the rebellion three weeks earlier on 8 March in order to divert attention from Aung San.[2]

March 27 had been commemorated as 'Resistance Day' until the military junta renamed it Tatmadaw (Armed Forces) Day.